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This CL adds a metric that records uniqueness of profile colors for
each Chrome installation. This is a proxy for "each profile has
different looks" as it ignores extension themes. This is a reasonable
simplification as the new profile UIs do not promote extension themes.

Bug: 1149315
Change-Id: I265957cc217915e703e0cc05aa3c9ada0e6b51dc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2534853Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Commit-Queue: Jan Krcal <jkrcal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828156}